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  • 10R80/10L90 Ford & GM Ten Speed Unique Filter System
    Monday, April 1, 2019 12:00 AM
    The new Ford and GM 10-speed transmission also has a newly developed filter and filtering system (Figure 2). This new filter design has two types of media, fine (white) and coarse (orange). The coarse material is common in most transmission filters, the fine media is a newer material and twice as large as the coarse media. This fine media is designed to catch the smaller particles of debris.
  • Hydraulics Fundamentals: Converter Clutch Control Part 1
    Monday, April 1, 2019 12:00 AM
    An understanding of hydraulics is essential for properly diagnosing and repairing transmission problems. This is part one of a two-part article on how an understanding of converter clutch control aids in transmission diagnostics. Part one describes fluid path and torque converter terminology. Part two addresses the valves that control those circuits and the clutch control.
  • R & R Tech: Transmission With a Mind of its Own
    Monday, April 1, 2019 12:00 AM
    A customer had brought in her 2010 Ford Escape equipped with a 3.0L engine and the 6F35 transaxle. The customers concern with the vehicle was that the transmission slipped intermittently. We started our evaluation with a quick visual inspection of the vehicle and checking fluids, all of which checked out good. Then I scanned the car with the scan tool; all of our locations have Snap-On Zeus workstations and I had two codes: a P0297, “Vehicle Over Speed Condition,” and a P1500, “Vehicle Speed Sensor.” No codes in any other modules. The next step was to go for a test drive and see if I could duplicate the complaint.
  • Technically Speaking: VLP-Line Pressure Too High
    Monday, April 1, 2019 12:00 AM
    A 2014 Dodge Journey 2.4L with a 41TES transmission came in to Electronica & Transmisiones in Buenos Aires Argentina. It had code P0869 set for Line Pressure High. Leonardo Luercho went out with the vehicle using his scan tool to begin his diagnostic approach. While observing the data parameter IDs in his scan tool, he noticed that there was a difference between desired and actual line pressure. Figure 1 is a photo of the graph displayed in his scan tool. The blue, more-active line is actual line pressure provided by the VLP sensor. The black, less-active line is the desired command given to the VLP solenoid by the computer.
  • Shift Pointers: Another Heart Break
    Friday, March 1, 2019 12:00 AM
    A 2014 Nissan Versa arrives at a shop on a flatbed with a customer complaint of a loss of engine power. The reason it was brought to a transmission shop is the type of engine power loss it had. In park or neutral, the engine can rev up to 2500 rpm easily. Even in drive with the brakes applied, you can reach stall speed torque with no power loss issues at all. But, the moment the brake is released to launch forward, as soon as it starts to roll there is an immediate loss of engine power.
  • Hydraulics Fundamentals: Secondary Regulators
    Friday, March 1, 2019 12:00 AM
    Jim Dial discusses the importance of understanding hydraulics when working with transmissions.
  • Ford Motor Company and the Hat Trick
    Friday, March 1, 2019 12:00 AM
    Mike Cargil examines the Ford 8F series 8-speed transmission line.
  • Two Unique Situations, Two Happy Customers
    Friday, March 1, 2019 12:00 AM
    Carman Klaber explains how two troubled vehicles were fixed and led to happy customers.
  • Leeward Tech: Helping or Hurting
    Friday, March 1, 2019 12:00 AM
    Ed Lee discusses rebuilt converters, and whether certain changes made to them help or actually hurt in the long run.
  • Technically Speaking: CVT 7 Troubles
    Friday, March 1, 2019 12:00 AM

    Wayne Colonna discusses the issues with the CVT7 transmission.

    The CVT 7 used in Mitsubishi and Nissan vehicles (Figure 1) is unique in that between the pulley assembly and the differential is a planetary gear set controlled by a reverse brake, a low brake and a high clutch.
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